| AKA Mechanical Ltd | Energy | 2015 |
| Alan Lowe Heating Services Ltd | Professional & scientific | 2021 |
| Alan's Test Centre (Burton) Ltd | Wholesale & retail | 2023 |
| Albion Brick Cutting Limited | Construction | 2008 |
| Albus Nova Ltd | Wholesale & retail | 2023 |
| Alchemy Motion Pictures Ltd | Information & communication | 2021 |
| Alesbrook Properties Ltd | Real estate | 2019 |
| Alex Daniel Limited | Administrative & support | 2023 |
| Alex Pearson Limited | Construction | 2024 |
| Alexander Global Ltd | Professional & scientific | 2024 |
| Alexander Homes (Midlands) Limited | Real estate | 2017 |
| Alexandria Business Park Management Company Limited | Professional & scientific | 2002 |
| Alive Holdings Ltd | Professional & scientific | 2018 |
| Allen Farming Ltd | Agriculture & fishing | 2013 |
| Allied Solutions Careers Limited | Administrative & support | 2018 |
| Allsopp (Construction) Limited | Construction | 2011 |
| Allton Builders Limited | Construction | 2005 |
| Allure Ltd | Administrative & support | 2018 |
| Almex Engineering Ltd | Manufacturing | 2009 |
| Alpha Install Solutions Ltd | Construction | 2022 |
| Alpha Vehicle Compliance Limited | Transport & logistics | 2021 |
| Alpha Vehicle Movements Limited | Wholesale & retail | 2012 |
| Alphire Developments Ltd | Construction | 2022 |
| Alphire Holdings Limited | Financial services | 2022 |
| Alphire Properties Ltd | Real estate | 2022 |
| Alternative Labour Supply Limited | Transport & logistics | 2018 |
| Alternative Pest Solutions Limited | Other services | 2025 |
| Altos Masonry Limited | Construction | 2011 |
| Alver (Madeley) Management Company Limited | Households | 2021 |
| AM Carbon Ltd | Construction | 2024 |
| Amare Vita Limited | Professional & scientific | 2022 |
| Amarjit Ltd | Wholesale & retail | 2024 |
| Amber Event Traffic Management Ltd | Other services | 2023 |
| Amber Grove (Kirk Langley) Management Company Limited | Households | 2023 |
| Amber Plant Limited | Professional & scientific | 1989 |
| American & (UK) Nails Limited | Other services | 2013 |
| Amos Accountancy Ltd | Professional & scientific | 2012 |
| AMR Nexus Ltd | Transport & logistics | 2019 |
| Amscon Limited | Information & communication | 2001 |
| Amstev Property Management Limited | Real estate | 2005 |
| AMY Camp Limited | Other services | 2018 |
| AMY Camp Salon Limited | Other services | 2018 |
| Anaroma Global-Sync Ltd | Wholesale & retail | 2026 |
| Anas Kitchen Limited | Hospitality | 2023 |
| Anashah Limited | Hospitality | 2018 |
| Anatome Education CIC | Information & communication | 2025 |
| Anchor Building Solutions Ltd | Construction | 2025 |
| Andrew James Property Developments Ltd | Construction | 2023 |
| Anghel Transport Ltd | Transport & logistics | 2026 |
| ANN Booth Enterprises Ltd. | Real estate | 2006 |
| Anolitha Limited | Health & social care | 2025 |
| ANT Farm Supplies Limited | Wholesale & retail | 2025 |
| Anvil Hire Limited | Administrative & support | 1993 |
| AP Housing Investments Limited | Real estate | 2021 |
| AP Taping Limited | Construction | 2024 |
| APC Sealants Limited | Construction | 2018 |
| Aperture Joinery Ltd | Manufacturing | 2023 |
| Aperture Stays Ltd | Hospitality | 2022 |
| Aperture Systems Limited | Construction | 2016 |
| Apex Spectrum Group Limited | Information & communication | 2003 |
| Apheli Health Limited | Professional & scientific | 2022 |
| Apollo 2024 Bidco Limited | Financial services | 2024 |
| Apollo 2024 Holdco Limited | Financial services | 2024 |
| Apollo 2024 Midco Limited | Financial services | 2024 |
| Apollo 2024 Topco Limited | Financial services | 2024 |
| Appleby Analytics Limited | Information & communication | 2024 |
| Appleby Consulting Services Limited | Professional & scientific | 2015 |
| Appleby Inn Limited | Hospitality | 2020 |
| Appleby Wood Creations Ltd | Manufacturing | 2024 |
| Appletree Lane (Marston Montgomery) Management Company Limited | Households | 2020 |
| Approved for Construction Limited | Construction | 2018 |
| Aptec Engineers (Burton) Limited | Manufacturing | 1995 |
| Aqua Exterior Cleaning Services Ltd | Administrative & support | 2026 |
| Aqua Swim Stars Ltd | Education | 2014 |
| Aquarius Distribution Limited | Wholesale & retail | 2020 |
| Aquatech Engineering Services Limited | Mining & quarrying | 2008 |
| Aquavir Ltd | Professional & scientific | 2024 |
| Arcane Anime Armoury Ltd | Wholesale & retail | 2026 |
| Arch Heating Ltd | Construction | 2020 |
| Archworksco Ltd | Manufacturing | 2025 |
| Arcis Resource Group Ltd | Water & waste | 2025 |
| Arden Corporation Limited | Wholesale & retail | 1987 |
| Arden Electrical (Midlands) Limited | Construction | 2011 |
| Areva Bodywork Limited | Extraterritorial | 1979 |
| Areva Services Limited | Extraterritorial | 1990 |
| Areva Transport Limited | Financial services | 1975 |
| ARG (Groundworks) Limited | Construction | 2007 |
| ARG Developments Ltd | Construction | 2025 |
| Aric Consulting Ltd | Education | 2019 |
| Arjan Construction Consultants Ltd | Real estate | 2019 |
| ARK Family Group Ltd | Financial services | 2026 |
| Arlani Limited | Wholesale & retail | 2025 |
| Arnchem Effective Valeting Limited | Wholesale & retail | 2012 |
| Arnchem Leisure Limited | Administrative & support | 2016 |
| Arrevolution Ltd | Manufacturing | 2019 |
| Arrow Chemicals Limited | Extraterritorial | 2006 |
| Arrow Solutions Limited | Extraterritorial | 2010 |
| Arrowflight Engineering Limited | Professional & scientific | 2025 |
| Art of Safety Ltd | Professional & scientific | 2023 |
| Artemis Fire Solutions Ltd | Administrative & support | 2017 |